Not trying to get too picky, but I must point out that the Maverick, Granada, and Monarch all have identical brakes... be they disc or drum. The only difference would be that 8 cyl cars have slightly heftier spindles and ever so slightly beefier rotors. Other than that, if you are comparing disc to disc, or drum to drum, they use the same components. Unlike a Stang though, all the other 3 cars use 5 lugs regardless of 6 or 8 cylinders after about 1971.
As for the rear...
The Granada/Monarch is only a half inch wider overall, with identical mounting points. Half inch wider than the Maverick rear that is... The Stang rear is identical, if not wider. The Granada/Monarchs also came with larger rear brakes than the Maverick no matter 8" or 9" rear.
Mavericks came with discs in 74-up, but power did not come along for a couple more years. The booster is very large and cumbersome, it also requires a unique driver's side tower brace that wouldn't fit the wider engine bay of the Stang. If power brakes become a part of your plans... there are instructions around the internet for making a Geo power brake booster work on shock tower type Fords. It's almost a direct bolt in and doesn't require mods to the brace or tower. It also sits straight up and down, instead of at the severe angle of the Maverick booster/master. This keeps you from having to raise the rear of the car way up to bleed the brakes.
Good luck
Dave